Overview
Short answer: pick Economics if you like diagrams, models and a bit of number-crunching, and pick Psychology if you would rather write about human behaviour with no maths but a large bank of studies to remember. Both sit in IB Group 3 (individuals and societies) and both reward clear, evaluative essay writing — but the day-to-day work is genuinely different. Economics leans on numbers and diagrams; Psychology leans on essays and named studies with no maths at all. This guide walks through what each is really like, how hard they are, and which one fits the way you think.
Economics vs Psychology at a glance
This section covers Economics vs Psychology at a glance — what IB examiners reward most often in past papers and coursework.
| Economics | Psychology | |
|---|---|---|
| Maths | Some — logical/quantitative reasoning; HL Paper 3 calculations | None |
| Diagrams / quantitative | Central — demand/supply, cost curves, macro models | None |
| Essays | Yes — theory + evaluation | Yes — the core of the course |
| Memorisation | Definitions, models, real-world examples | Heavy — named studies (aim, procedure, findings) |
| Difficulty | Conceptual + quantitative under time pressure | Volume of studies + disciplined criteria writing |
| Best for | Graph-thinkers who like models and some numbers | Writers who enjoy human behaviour and can memorise |
What IB Economics is really like
For the IB Diploma Programme, economics is built on theory you apply, not theory you just recite. You learn models — supply and demand, elasticity, market failure, aggregate demand and supply, the business cycle — and then use diagrams to show what happens when something changes. Drawing an accurate, well-labelled diagram and explaining the mechanism behind it is a core skill; a lot of marks live in that explanation.
On top of the theory sits evaluation. Higher-mark questions ask you to weigh up policies, consider stakeholders, question assumptions, and reach a supported judgement. That is where strong essay writers do well.
At HL there is also Paper 3, a quantitative paper. You work through calculations such as price elasticities, the Keynesian multiplier, comparative advantage, and exchange-rate maths. None of it is university-level maths, but you do need to be comfortable manipulating numbers and formulas under time pressure. If numbers make you switch off, that is worth knowing before you commit to HL.
You can preview the syllabus and question styles through our IB Economics SL course and, for the quantitative Paper 3 side, Economics HL.
What IB Psychology is really like
For the IB Diploma Programme, psychology has no maths — there are no diagrams to draw and no calculations to perform. What it does have is a lot of studies. You learn named pieces of research (the aim, the procedure, the findings and the conclusion) and, crucially, you must use them as evidence to build and support arguments. Knowing a study exists is not enough; you have to deploy the right one at the right moment to back a claim.
Assessment is essay-driven. Short-answer questions are marked to a /9 rubric and full essays to a /22 rubric. Two criteria tend to decide grades: criterion C (use of research) — whether your studies are relevant, accurate and clearly linked to the question — and criterion D (critical thinking) — whether you evaluate that research rather than just describe it. Students who memorise studies but never critique them plateau; the marks are in the analysis.
So Psychology rewards a specific combination: a good memory for detail plus the discipline to write to a rubric, again and again. You can see how the criteria play out in practice in our IB Psychology SL course, with the extra HL content covered in Psychology HL.
The maths-and-diagrams vs essays-and-studies decision
For the IB Diploma Programme, this is the cleanest way to choose. Ask yourself which sentence sounds more like you:
- "I would rather read a graph, spot the trend, and reason through the numbers." → Economics.
- "I would rather write a tight, evidence-backed essay and never touch a calculation." → Psychology.
Economics asks you to think in models and diagrams and to be comfortable with some quantitative work (a lot of it at HL). Psychology asks you to hold a large body of studies in your head and turn them into critical argument on demand. Both need essay skill — that part is common ground. The dividing line is whether you want numbers and visuals in the mix, or words and evidence only.
Difficulty — is one harder?
For the IB Diploma Programme, neither is objectively "the easy option," and we will not quote invented grade statistics to pretend otherwise. They are hard in different ways.
Economics is demanding because you combine conceptual understanding, accurate diagrams and evaluation — and at HL you add timed calculations. If quantitative reasoning is a weakness, HL Economics will feel harder than the reputation suggests.
Psychology is demanding because of volume and precision: there is a lot to memorise, and recall alone does not score. You have to write to strict criteria and evaluate research critically, essay after essay. If you dislike sustained memorisation or struggle to critique rather than describe, it will feel harder than "no maths" implies.
In short: choose based on the type of difficulty that suits you, not a myth about which is lighter. For a deeper look, see Is IB Economics hard? and Is IB Psychology hard?.
For university
For the IB Diploma Programme, this can be the deciding factor, so check it early.
- Economics is often preferred or required for economics, PPE, finance and some business degrees — frequently alongside HL Maths. If a quantitative degree is on your radar, Economics (and strong maths) strengthens your application meaningfully.
- Psychology is a useful and relevant subject but is rarely strictly required to study psychology at university — many courses value sciences or maths more, and some have no specific subject requirement at all.
Requirements vary by country and institution, so always read the actual entry requirements on each university's course page rather than relying on general advice.
Who should pick which
For the IB Diploma Programme, pick Economics if you:
- Enjoy graphs, models and cause-and-effect reasoning
- Are comfortable with some numbers (essential at HL for Paper 3)
- Are aiming at economics, PPE, finance or quantitative fields
- Like applying theory to current events and policy
Pick Psychology if you:
- Are fascinated by why people behave as they do
- Want a Group 3 subject with no maths
- Have a strong memory and can retain detailed studies
- Enjoy building evidence-based, critical arguments in essays
How to decide
This section covers How to decide — what IB examiners reward most often in past papers and coursework.
- Try both. Attempt one topic from each — draw an Economics diagram and evaluate it; write a short Psychology answer using a study — and notice which felt natural.
- Check your target degrees. If economics/PPE/finance is likely, that often settles it toward Economics (plus HL Maths).
- Be honest about maths. Comfortable with numbers → Economics is open to you. Want to avoid maths entirely → Psychology.
- Be honest about memory. Willing to memorise and critique many studies → Psychology suits you.
- Balance your overall diploma. Consider your other five subjects and workload before locking one in.
How MarkScheme helps you try both
The best way to choose is to sample the real work, not the reputation. On MarkScheme you can preview both syllabuses side by side — [Economics SL](/ib/courses/economics-sl)/[HL](/ib/courses/economics-hl) and [Psychology SL](/ib/courses/psychology-sl)/[HL](/ib/courses/psychology-hl) — see the question styles, and then [get an answer marked](/mark) against the actual criteria to feel the difference between diagram-and-evaluation marking and criterion C/D essay marking. For more on choosing subjects across the diploma, browse the [IB guides hub](/guides/ib).
Frequently asked questions
For the IB Diploma Programme, neither is reliably easier — they are hard in different ways. Economics blends concepts, diagrams and (at HL) calculations; Psychology demands heavy memorisation plus disciplined critical writing. Pick the type of challenge that fits you.
Is IB Economics or Psychology easier?
Does IB Psychology have maths?
No. IB Psychology involves no calculations and no diagrams to draw. It is essay- and memory-based: you learn studies and use them to build evaluated arguments.
Do I need to be good at maths for IB Economics?
You need to be comfortable with logical, quantitative reasoning, especially at HL where Paper 3 includes calculations (elasticities, the multiplier, comparative advantage, exchange rates). It is not advanced maths, but numbers are unavoidable.
Can I take both Economics and Psychology?
Sometimes. Both are Group 3 subjects, so taking both usually means using another subject group's slot for one of them, which your school's option blocks may or may not allow. Check with your IB coordinator.
Which is better for a psychology degree?
IB Psychology is relevant and helpful but is rarely a strict requirement. Many psychology courses value sciences or maths more, and requirements differ by university — always check the specific entry requirements for your target courses.